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rcu/kfree: Fix kfree_rcu_shrink_count() return value

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As per the comments in include/linux/shrinker.h, .count_objects callback
should return the number of freeable items, but if there are no objects
to free, SHRINK_EMPTY should be returned. The only time 0 is returned
should be when we are unable to determine the number of objects, or the
cache should be skipped for another reason.

Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Joel Fernandes (Google) 2022-06-22 22:51:02 +00:00 committed by Paul E. McKenney
parent 093590c16b
commit 3826909635
1 changed files with 1 additions and 1 deletions
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2
kernel/rcu/tree.c
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@ -3372,7 +3372,7 @@ kfree_rcu_shrink_count(struct shrinker *shrink, struct shrink_control *sc)
atomic_set(&krcp->backoff_page_cache_fill, 1);
}
return count;
return count == 0 ? SHRINK_EMPTY : count;
}
static unsigned long